Initial implementation of experimental gamma ramp API.

readme.html

@@ -802,6 +802,9 @@ their skills.  Special thanks go out to:</p>
   <li>Jonathan Dummer, for submitting a patch fixing an input bug on Win32 and
   adding logic for the <code>GLFW_ICON</code> resource</li>
 
+  <li>Ralph Eastwood, for the initial design of the gamma correction API and
+  the Win32 and X11 implementations of it</li>
+
   <li>Gerald Franz, who made GLFW compile under IRIX, and supplied patches
   for the X11 keyboard translation routine</li>